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commit-graph: Support lookups of entries in a commit-graph

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This change introduces `git_commit_graph_entry_find()` and
`git_commit_graph_entry_parent()`. These two functions allow a much
faster lookup of commits by ID, since the ODB does not need to be
consulted, the commit object does not need to be inflated, and the
contents of the commit object do not need to be parsed.

Part of: #5757
This commit is contained in:
lhchavez
2021-01-04 19:33:48 -08:00
parent 3fd57a75e9
commit 1f32ed25ee
5 changed files with 252 additions and 0 deletions
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5
fuzzers/commit_graph_fuzzer.c
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@@ -32,6 +32,7 @@ int LLVMFuzzerInitialize(int *argc, char ***argv)
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
git_commit_graph_file cgraph = {{0}};
git_commit_graph_entry e;
git_buf commit_graph_buf = GIT_BUF_INIT;
git_oid oid = {{0}};
bool append_hash = false;
@@ -68,6 +69,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
< 0)
goto cleanup;
/* Search for any oid, just to exercise that codepath. */
if (git_commit_graph_entry_find(&e, &cgraph, &oid, GIT_OID_HEXSZ) < 0)
goto cleanup;
cleanup:
git_commit_graph_close(&cgraph);
git_buf_dispose(&commit_graph_buf);