commit-graph: prefer default size_mult when given zero
In 50f26bd ("fetch: add fetch.writeCommitGraph config setting",
2019-09-02), the fetch builtin added the capability to write a
commit-graph using the "--split" feature. This feature creates
multiple commit-graph files, and those can merge based on a set
of "split options" including a size multiple. The default size
multiple is 2, which intends to provide a log_2 N depth of the
commit-graph chain where N is the number of commits.
However, I noticed during dogfooding that my commit-graph chains
were becoming quite large when left only to builds by 'git fetch'.
It turns out that in split_graph_merge_strategy(), we default the
size_mult variable to 2 except we override it with the context's
split_opts if they exist. In builtin/fetch.c, we create such a
split_opts, but do not populate it with values.
This problem is due to two failures:
1. It is unclear that we can add the flag COMMIT_GRAPH_WRITE_SPLIT
with a NULL split_opts.
2. If we have a non-NULL split_opts, then we override the default
values even if a zero value is given.
Correct both of these issues. First, do not override size_mult when
the options provide a zero value. Second, stop creating a split_opts
in the fetch builtin.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 863c858..0c15f34 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1867,15 +1867,13 @@
prepare_repo_settings(the_repository);
if (the_repository->settings.fetch_write_commit_graph) {
int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;
- struct split_commit_graph_opts split_opts;
- memset(&split_opts, 0, sizeof(struct split_commit_graph_opts));
if (progress)
commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;
write_commit_graph_reachable(get_object_directory(),
commit_graph_flags,
- &split_opts);
+ NULL);
}
close_object_store(the_repository->objects);
diff --git a/commit-graph.c b/commit-graph.c
index 0aea7b2..baa1a26 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1545,7 +1545,9 @@
if (ctx->split_opts) {
max_commits = ctx->split_opts->max_commits;
- size_mult = ctx->split_opts->size_multiple;
+
+ if (ctx->split_opts->size_multiple)
+ size_mult = ctx->split_opts->size_multiple;
}
g = ctx->r->objects->commit_graph;
