stat the npm files

roles/sugarizer/defaults/main.yml

@@ -2,3 +2,4 @@ sugarizer_install: True
 sugarizer_enabled: False
 sugarizer_location: '{{ doc_root }}'
 sugarizer_version: 'sugarizer-0.8'
+npm_exists: False

roles/sugarizer/tasks/main.yml

@@ -21,13 +21,23 @@
            state=present
   when: internet_available and not is_debian
 
+# attempting to reinstall npn is broken on raspbian 9
+- name: check for npm already installed
+  stat: path={{ sugarizer_location }}/sugarizer/server/node_modules
+  register: npm
+
+- name: set a flag to abort second attempt to install
+  set_fact: 
+     npm_exists: True
+  when npm.stat.exists is defined and npm.stat.exists
+
 - name: Install npm on debian -- set up apt sources
   shell: curl -sL https://deb.nodesource.com/setup_6.x | bash -
-  when: internet_available and is_debian
+  when: internet_available and is_debian and not npm_exists
 
 - name: Actually get it installed
   command: apt install -y npm
-  when: internet_available and is_debian
+  when: internet_available and is_debian and not npm_exists
 
 - name: Create systemd files and copy our ini file 
   template: src={{ item.src }}