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commit-graph: build graph from starting commits

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Teach git-commit-graph to read commits from stdin when the
--stdin-commits flag is specified. Commits reachable from these
commits are added to the graph. This is a much faster way to construct
the graph than inspecting all packed objects, but is restricted to
known tips.

For the Linux repository, 700,000+ commits were added to the graph
file starting from 'master' in 7-9 seconds, depending on the number
of packfiles in the repo (1, 24, or 120).

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-04-10 08:56:07 -04:00
committed by Junio C Hamano
parent 049d51a2bb
commit 3d5df01b5e
5 changed files with 75 additions and 10 deletions
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27
commit-graph.c
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@ -551,7 +551,9 @@ static void close_reachable(struct packed_oid_list *oids)
void write_commit_graph(const char *obj_dir,
const char **pack_indexes,
int nr_packs)
int nr_packs,
const char **commit_hex,
int nr_commits)
{
struct packed_oid_list oids;
struct packed_commit_list commits;
@ -591,7 +593,28 @@ void write_commit_graph(const char *obj_dir,
close_pack(p);
}
strbuf_release(&packname);
} else
}
if (commit_hex) {
for (i = 0; i < nr_commits; i++) {
const char *end;
struct object_id oid;
struct commit *result;
if (commit_hex[i] && parse_oid_hex(commit_hex[i], &oid, &end))
continue;
result = lookup_commit_reference_gently(&oid, 1);
if (result) {
ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc);
oidcpy(&oids.list[oids.nr], &(result->object.oid));
oids.nr++;
}
}
}
if (!pack_indexes && !commit_hex)
for_each_packed_object(add_packed_commits, &oids, 0);
close_reachable(&oids);