Consider template GUACAMOLE_HOME in Docker image configuration sanity checks.
@@ -427,7 +427,7 @@ fi
# Validate that at least one authentication backend is installed
#
-if [ -z "$INSTALLED_AUTH" ]; then
+if [ -z "$INSTALLED_AUTH" -a -z "$GUACAMOLE_HOME_TEMPLATE" ]; then
cat <<END
FATAL: No authentication configured
-------------------------------------------------------------------------------
@@ -435,7 +435,7 @@ The Guacamole Docker container needs at least one authentication mechanism in
order to function, such as a MySQL database, PostgreSQL database, or LDAP
directory. Please specify at least the MYSQL_DATABASE or POSTGRES_DATABASE
environment variables, or check Guacamole's Docker documentation regarding
-configuring LDAP.
+configuring LDAP and/or custom extensions.
END
exit 1;
fi
