From f28bad075bc46c95dd2e52037d6e52d1621d2a49 Mon Sep 17 00:00:00 2001
From: John Estabrook <jestabro@vyos.io>
Date: Sun, 23 Nov 2025 15:10:01 -0600
Subject: T8032: add vyconfd handlers for config_unsaved

---
 src/session.ml  | 16 ++++++++++++----
 src/session.mli |  2 ++
 src/vyconfd.ml  | 11 +++++++++++
 3 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/src/session.ml b/src/session.ml
index 248121d..478c423 100644
--- a/src/session.ml
+++ b/src/session.ml
@@ -379,6 +379,18 @@ let save w s file =
     | Error e -> raise (Session_error (Printf.sprintf "Error saving config: %s" e))
     | Ok () -> s
 
+let remove_file file =
+    if Sys.file_exists file then Sys.remove file
+
+let config_unsaved w s file id =
+    let tmp_save = Printf.sprintf "/tmp/config.running_%s" id in
+    let res =
+        try
+            let _ = save w s tmp_save in
+            not (Vyos1x.Util.file_compare ~ignore_line_prefix:"//" tmp_save file)
+        with Session_error _ -> true (* false positive on unlikely error *)
+    in remove_file tmp_save; res
+
 let write_running_cache w =
     (* alert exn Internal.write_internal:
         [Internal.Write_error] caught
@@ -480,10 +492,6 @@ let get_config w s id =
     in id
 
 let cleanup_config w id =
-    let remove_file file =
-        if Sys.file_exists file then
-            Sys.remove file
-    in
     let vc = w.vyconf_config in
     let running_cache = Printf.sprintf "%s_%s" vc.running_cache id in
     let session_cache = Printf.sprintf "%s_%s" vc.session_cache id in
diff --git a/src/session.mli b/src/session.mli
index 757bc18..cb49bf6 100644
--- a/src/session.mli
+++ b/src/session.mli
@@ -69,6 +69,8 @@ val merge : world -> session_data -> string -> bool -> session_data
 
 val save : world -> session_data -> string -> session_data
 
+val config_unsaved : world -> session_data -> string -> string -> bool
+
 val get_value : world -> session_data -> string list -> string
 
 val get_values : world -> session_data -> string list -> string list
diff --git a/src/vyconfd.ml b/src/vyconfd.ml
index ed84978..dc302e5 100644
--- a/src/vyconfd.ml
+++ b/src/vyconfd.ml
@@ -407,6 +407,16 @@ let edit_level_root world token (_req: request_edit_level_root) =
     if Session.edit_level_root world (find_session token) then response_tmpl
     else {response_tmpl with status=Fail}
 
+let config_unsaved world token (req: request_config_unsaved) =
+    let saved_file =
+        match req.file with
+        | None -> defaults.legacy_config_path
+        | Some file -> file
+    in
+    if Session.config_unsaved world (find_session token) saved_file token
+    then response_tmpl
+    else {response_tmpl with status=Fail}
+
 let send_response oc resp =
     let enc = Pbrt.Encoder.create () in
     let%lwt () = encode_pb_response resp enc |> return in
@@ -463,6 +473,7 @@ let rec handle_connection world ic oc () =
                     | Some t, Reset_edit_level r -> reset_edit_level world t r
                     | Some t, Get_edit_level r -> get_edit_level world t r
                     | Some t, Edit_level_root r -> edit_level_root world t r
+                    | Some t, Config_unsaved r -> config_unsaved world t r
                     | _ -> failwith "Unimplemented"
                     ) |> Lwt.return
                end
-- 
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