diff --git a/youngjin.han/dot-cdist/type/__my_nginx_site/manifest b/youngjin.han/dot-cdist/type/__my_nginx_site/manifest
index 56e3762..0b17ddf 100755
--- a/youngjin.han/dot-cdist/type/__my_nginx_site/manifest
+++ b/youngjin.han/dot-cdist/type/__my_nginx_site/manifest
@@ -1,5 +1,17 @@
 #!/bin/sh -e
 
+os=$(cat "$__global/explorer/os")
+
+case "$os" in
+    devuan)
+        :
+        ;;
+    *)
+        echo "OS $os currently not supported" >&2
+        exit 1
+        ;;
+esac
+
 nginx_config_dir="/etc/nginx/conf.d"
 domain="$__object_id"