[PATCH 1/2] fetch: add the command-line option `--write-commit-graph`

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

This option overrides the config setting `fetch.writeCommitGraph`, if
both are set.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 Documentation/fetch-options.txt | 4 ++++
 builtin/fetch.c                 | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
index 43b9ff3bce..a2f78624a2 100644
--- a/Documentation/fetch-options.txt
+++ b/Documentation/fetch-options.txt
@@ -92,6 +92,10 @@ ifndef::git-pull[]
 	Run `git gc --auto` at the end to perform garbage collection
 	if needed. This is enabled by default.
 
+--[no-]write-commit-graph::
+	Write a commit-graph after fetching. This overrides the config
+	setting `fetch.writeCommitGraph`.
+
 -p::
 --prune::
 	Before fetching, remove any remote-tracking references that no
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 0c345b5dfe..ba2a81c392 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -77,6 +77,7 @@ static struct refspec refmap = REFSPEC_INIT_FETCH;
 static struct list_objects_filter_options filter_options;
 static struct string_list server_options = STRING_LIST_INIT_DUP;
 static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
+static int fetch_write_commit_graph = -1;
 
 static int git_fetch_config(const char *k, const char *v, void *cb)
 {
@@ -198,6 +199,8 @@ static struct option builtin_fetch_options[] = {
 		 N_("run 'gc --auto' after fetching")),
 	OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
 		 N_("check for forced-updates on all updated branches")),
+	OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
+		 N_("write the commit-graph after fetching")),
 	OPT_END()
 };
 
@@ -1865,7 +1868,9 @@ 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) {
+	if (fetch_write_commit_graph > 0 ||
+	    (fetch_write_commit_graph < 0 &&
+	     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));
-- 
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