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commit-graph: refactor parse_commit_graph() to take a repository

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Refactor `parse_commit_graph()` so that it takes a repository instead of
taking repository settings. On the one hand this allows us to get rid of
instances where we access `the_hash_algo` by using the repository's hash
algorithm instead. On the other hand it also allows us to move the call
of `prepare_repo_settings()` into the function itself.

Note that there's one small catch, as the commit-graph fuzzer calls this
function directly without having a fully functional repository at hand.
And while the fuzzer already initializes `the_repository` with relevant
info, the call to `prepare_repo_settings()` would fail because we don't
have a fully-initialized repository.

Work around the issue by also settings `settings.initialized` to pretend
that we've already read the settings.

While at it, remove the redundant `parse_commit_graph()` declaration in
the fuzzer. It was added together with aa658574bf (commit-graph, fuzz:
add fuzzer for commit-graph, 2019-01-15), but as we also declared the
same function in "commit-graph.h" it wasn't ever needed.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-08-15 07:49:49 +02:00
committed by Junio C Hamano
parent e45402bb19
commit f1141b4391
3 changed files with 15 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
commit-graph.c
View File

@@ -272,9 +272,8 @@ struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
}
graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
prepare_repo_settings(r);
ret = parse_commit_graph(&r->settings, graph_map, graph_size);
ret = parse_commit_graph(r, graph_map, graph_size);
if (ret)
ret->odb_source = source;
else
@@ -374,7 +373,7 @@ static int graph_read_bloom_data(const unsigned char *chunk_start,
return 0;
}
struct commit_graph *parse_commit_graph(struct repo_settings *s,
struct commit_graph *parse_commit_graph(struct repository *r,
void *graph_map, size_t graph_size)
{
const unsigned char *data;
@@ -386,7 +385,7 @@ struct commit_graph *parse_commit_graph(struct repo_settings *s,
if (!graph_map)
return NULL;
if (graph_size < graph_min_size(the_hash_algo))
if (graph_size < graph_min_size(r->hash_algo))
return NULL;
data = (const unsigned char *)graph_map;
@@ -406,22 +405,22 @@ struct commit_graph *parse_commit_graph(struct repo_settings *s,
}
hash_version = *(unsigned char*)(data + 5);
if (hash_version != oid_version(the_hash_algo)) {
if (hash_version != oid_version(r->hash_algo)) {
error(_("commit-graph hash version %X does not match version %X"),
hash_version, oid_version(the_hash_algo));
hash_version, oid_version(r->hash_algo));
return NULL;
}
graph = alloc_commit_graph();
graph->hash_algo = the_hash_algo;
graph->hash_algo = r->hash_algo;
graph->num_chunks = *(unsigned char*)(data + 6);
graph->data = graph_map;
graph->data_len = graph_size;
if (graph_size < GRAPH_HEADER_SIZE +
(graph->num_chunks + 1) * CHUNK_TOC_ENTRY_SIZE +
GRAPH_FANOUT_SIZE + the_hash_algo->rawsz) {
GRAPH_FANOUT_SIZE + r->hash_algo->rawsz) {
error(_("commit-graph file is too small to hold %u chunks"),
graph->num_chunks);
free(graph);
@@ -452,7 +451,9 @@ struct commit_graph *parse_commit_graph(struct repo_settings *s,
pair_chunk(cf, GRAPH_CHUNKID_BASE, &graph->chunk_base_graphs,
&graph->chunk_base_graphs_size);
if (s->commit_graph_generation_version >= 2) {
prepare_repo_settings(r);
if (r->settings.commit_graph_generation_version >= 2) {
read_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA,
graph_read_generation_data, graph);
pair_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA_OVERFLOW,
@@ -463,7 +464,7 @@ struct commit_graph *parse_commit_graph(struct repo_settings *s,
graph->read_generation_data = 1;
}
if (s->commit_graph_changed_paths_version) {
if (r->settings.commit_graph_changed_paths_version) {
read_chunk(cf, GRAPH_CHUNKID_BLOOMINDEXES,
graph_read_bloom_index, graph);
read_chunk(cf, GRAPH_CHUNKID_BLOOMDATA,
@@ -480,7 +481,7 @@ struct commit_graph *parse_commit_graph(struct repo_settings *s,
}
oidread(&graph->oid, graph->data + graph->data_len - graph->hash_algo->rawsz,
the_repository->hash_algo);
r->hash_algo);
free_chunkfile(cf);
return graph;

2
commit-graph.h
View File

@@ -128,7 +128,7 @@ struct repo_settings;
* Callers should initialize the repo_settings with prepare_repo_settings()
* prior to calling parse_commit_graph().
*/
struct commit_graph *parse_commit_graph(struct repo_settings *s,
struct commit_graph *parse_commit_graph(struct repository *r,
void *graph_map, size_t graph_size);
/*

6
oss-fuzz/fuzz-commit-graph.c
View File

@@ -4,9 +4,6 @@
#include "commit-graph.h"
#include "repository.h"
struct commit_graph *parse_commit_graph(struct repo_settings *s,
void *graph_map, size_t graph_size);
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
@@ -22,9 +19,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
* possible.
*/
repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
the_repository->settings.initialized = 1;
the_repository->settings.commit_graph_generation_version = 2;
the_repository->settings.commit_graph_changed_paths_version = 1;
g = parse_commit_graph(&the_repository->settings, (void *)data, size);
g = parse_commit_graph(the_repository, (void *)data, size);
repo_clear(the_repository);
free_commit_graph(g);