By default, git-repack(1) will update server info that is required by
the dumb HTTP transport. This can be skipped by passing the `-n` flag,
but what we're noticably missing is a config option to permanently
disable updating this information.

Add a new option "repack.updateServerInfo" which can be used to disable
the logic. Most hosting providers have turned off the dumb HTTP protocol
anyway, and on the client-side it woudln't typically be useful either.
Giving a persistent way to disable this feature thus makes quite some
sense to avoid wasting compute cycles and storage.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 Documentation/config/repack.txt |  3 +++
 builtin/repack.c                |  6 ++++-
 t/t7700-repack.sh               | 47 +++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/Documentation/config/repack.txt b/Documentation/config/repack.txt
index 9c413e177e..22bfc26afc 100644
--- a/Documentation/config/repack.txt
+++ b/Documentation/config/repack.txt
@@ -25,3 +25,6 @@ repack.writeBitmaps::
 	space and extra time spent on the initial repack.  This has
 	no effect if multiple packfiles are created.
 	Defaults to true on bare repos, false otherwise.
+
+repack.updateServerInfo::
+	If set to false, git-repack will not run git-update-server-info.
diff --git a/builtin/repack.c b/builtin/repack.c
index da1e364a75..3baa993da2 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -22,6 +22,7 @@ static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
 static int write_bitmaps = -1;
 static int use_delta_islands;
+static int no_update_server_info = 0;
 static char *packdir, *packtmp_name, *packtmp;
 
 static const char *const git_repack_usage[] = {
@@ -54,6 +55,10 @@ static int repack_config(const char *var, const char *value, void *cb)
 		use_delta_islands = git_config_bool(var, value);
 		return 0;
 	}
+	if (strcmp(var, "repack.updateserverinfo") == 0) {
+		no_update_server_info = !git_config_bool(var, value);
+		return 0;
+	}
 	return git_default_config(var, value, cb);
 }
 
@@ -620,7 +625,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	const char *unpack_unreachable = NULL;
 	int keep_unreachable = 0;
 	struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
-	int no_update_server_info = 0;
 	struct pack_objects_args po_args = {NULL};
 	int geometric_factor = 0;
 	int write_midx = 0;
diff --git a/t/t7700-repack.sh b/t/t7700-repack.sh
index 5922fb5bdd..f049120022 100755
--- a/t/t7700-repack.sh
+++ b/t/t7700-repack.sh
@@ -381,4 +381,51 @@ test_expect_success TTY '--quiet disables progress' '
 	test_must_be_empty stderr
 '
 
+test_expect_success 'updates server info by default' '
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	test_commit -C repo message &&
+	test_path_is_missing repo/.git/objects/info/packs &&
+	test_path_is_missing repo/.git/info/refs &&
+	git -C repo repack &&
+	test_path_is_file repo/.git/objects/info/packs &&
+	test_path_is_file repo/.git/info/refs
+'
+
+test_expect_success '-n skips updating server info' '
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	test_commit -C repo message &&
+	git -C repo repack -n &&
+	test_path_is_missing repo/.git/objects/info/packs &&
+	test_path_is_missing repo/.git/info/refs
+'
+
+test_expect_success 'repack.updateServerInfo=true updates server info' '
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	test_commit -C repo message &&
+	git -C repo -c repack.updateServerInfo=true repack &&
+	test_path_is_file repo/.git/objects/info/packs &&
+	test_path_is_file repo/.git/info/refs
+'
+
+test_expect_success 'repack.updateServerInfo=false skips updating server info' '
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	test_commit -C repo message &&
+	git -C repo -c repack.updateServerInfo=false repack &&
+	test_path_is_missing repo/.git/objects/info/packs &&
+	test_path_is_missing repo/.git/info/refs
+'
+
+test_expect_success '-n overrides repack.updateServerInfo=true' '
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	test_commit -C repo message &&
+	git -C repo -c repack.updateServerInfo=true repack -n &&
+	test_path_is_missing repo/.git/objects/info/packs &&
+	test_path_is_missing repo/.git/info/refs
+'
+
 test_done
-- 
2.35.1