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fetch: add fetch.writeCommitGraph config setting

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The commit-graph feature is now on by default, and is being
written during 'git gc' by default. Typically, Git only writes
a commit-graph when a 'git gc --auto' command passes the gc.auto
setting to actualy do work. This means that a commit-graph will
typically fall behind the commits that are being used every day.

To stay updated with the latest commits, add a step to 'git
fetch' to write a commit-graph after fetching new objects. The
fetch.writeCommitGraph config setting enables writing a split
commit-graph, so on average the cost of writing this file is
very small. Occasionally, the commit-graph chain will collapse
to a single level, and this could be slow for very large repos.

For additional use, adjust the default to be true when
feature.experimental is enabled.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2019-09-02 19:22:02 -07:00
committed by Junio C Hamano
parent aaf633c2ad
commit 50f26bd035
6 changed files with 51 additions and 0 deletions
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15
builtin/fetch.c
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@ -23,6 +23,7 @@
#include "packfile.h"
#include "list-objects-filter-options.h"
#include "commit-reach.h"
#include "commit-graph.h"
#define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
@ -1715,6 +1716,20 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
string_list_clear(&list, 0);
prepare_repo_settings(the_repository);
if (the_repository->settings.fetch_write_commit_graph) {
int commit_graph_flags = COMMIT_GRAPH_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_PROGRESS;
write_commit_graph_reachable(get_object_directory(),
commit_graph_flags,
&split_opts);
}
close_object_store(the_repository->objects);
if (enable_auto_gc) {