move install test to last item copied (#213)

roles/kiwix/tasks/kiwix_install.yml

@@ -9,6 +9,15 @@
     - "{{ kiwix_content_path }}"
     - "{{ iiab_zim_path }}/index"
 
+- name: Check for kiwix-serve binary
+  stat: path={{ iiab_base }}/kiwix/bin/kiwix-serve
+  retister: kiwix_bin
+
+- name: Set kiwix first pass
+  set_fact:
+    kiwix_first_pass: True
+  when: kiwix_bin.stat.exists is defined and not kiwix_bin.stat.exists
+
 - name: Copy kiwix library file if needed
   template: src={{ item }}
             dest="{{ kiwix_library_xml }}"
@@ -18,12 +27,7 @@
             force=no
   with_items:
     - library.xml
-  register: kiwix_first_pass_test
-
-- name: Set kiwix first pass
-  set_fact:
-    kiwix_first_pass: True
-  when: kiwix_first_pass_test.changed
+  when: kiwix_first_pass
 
 - name: Copy test.zim file
   copy: src=test.zim