From 2880c8f4eb6c69ffdcdeec3cccc481761448098d Mon Sep 17 00:00:00 2001
From: Andrew Mayorov <encube.ul@gmail.com>
Date: Tue, 21 Mar 2023 00:11:30 +0300
Subject: [PATCH] fix(ft): unwrap error details when reader fails to start

---
 apps/emqx_ft/src/emqx_ft_storage_fs_reader_sup.erl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/apps/emqx_ft/src/emqx_ft_storage_fs_reader_sup.erl b/apps/emqx_ft/src/emqx_ft_storage_fs_reader_sup.erl
index 934e2888c..fff6b7830 100644
--- a/apps/emqx_ft/src/emqx_ft_storage_fs_reader_sup.erl
+++ b/apps/emqx_ft/src/emqx_ft_storage_fs_reader_sup.erl
@@ -33,7 +33,12 @@ start_child(CallerPid, Filename) ->
         start => {emqx_ft_storage_fs_reader, start_link, [CallerPid, Filename]},
         restart => temporary
     },
-    supervisor:start_child(?MODULE, Childspec).
+    case supervisor:start_child(?MODULE, Childspec) of
+        {ok, Pid} ->
+            {ok, Pid};
+        {error, {Reason, _Child}} ->
+            {error, Reason}
+    end.
 
 init(_) ->
     SupFlags = #{