On Tue, Nov 19, 2019 at 03:33:08PM +0100, SZEDER Gábor wrote:

quoted

+	argv_array_pushl(&argv, "config", "--worktree", "core.sparseCheckout", NULL);
+
+	if (mode)
+		argv_array_pushl(&argv, "true", NULL);
+	else
+		argv_array_pushl(&argv, "false", NULL);
+
+	if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
+		error(_("failed to enable core.sparseCheckout"));
+		return 1;
+	}

Why the external 'git config' invocation?

  git_config_set_in_file_gently(git_path("config.worktree"),
                                "core.sparseCheckout",
                                mode ? "true" : "false")

Having slept on it, I think it would be even better to pass NULL
instead of "false".  "false", well, just sets the configuration
variable to false, but a NULL would properly unset it.