PR #16186, split for re-review

src/lib/cli_lib/flag.ml

@@ -33,6 +33,15 @@ let conf_dir =
   flag "--config-directory" ~aliases:[ "config-directory" ]
     ~doc:"DIR Configuration directory" (optional string)
 
+let config_files =
+  let open Command.Param in
+  flag "--config-file" ~aliases:[ "config-file" ]
+    ~doc:
+      "PATH path to a configuration file (overrides MINA_CONFIG_FILE, default: \
+       <config_dir>/daemon.json). Pass multiple times to override fields from \
+       earlier config files"
+    (listed string)
+
 module Doc_builder = struct
   type 'value t =
     { type_name : string

src/lib/cli_lib/flag.mli

@@ -12,6 +12,8 @@ val privkey_read_path : string Command.Param.t
 
 val conf_dir : string option Command.Param.t
 
+val config_files : string list Command.Param.t
+
 module Types : sig
   type 'a with_name = { name : string; value : 'a }