mod_auth_external.patch

diff -r 933049a60ce6 mod_auth_external/mod_auth_external.lua
--- a/mod_auth_external/mod_auth_external.lua   Thu Jan 04 11:41:54 2018 +0100
+++ b/mod_auth_external/mod_auth_external.lua   Fri Jan 12 05:26:22 2018 -0500
@@ -75,6 +75,15 @@
                log("debug", "Started auth process");
        end
 
+       -- Hotfix: lpty has a glitch in some versions: no_local_echo=true is not respected until *after*
+       --         the first read happens, it seems. The first do_query() therefore fails because it reads
+       --         back the query that was sent in, so the first login after restarting prosody -- or after
+       --         any time the auth process crashes -- mysteriously fails.
+       --         By calling read() immediately and discarding the result, we skip the problem;
+       --         The protocol says that this first read should be empty, since the subprocess shouldn't
+       --         be giving us any data until we probe it.
+       pty:read(read_timeout);
+
        pty:send(text);
        if blocking then
                return pty:read(read_timeout);