share - only rewrite repo defs if cacher exists.

Closes #23

share/install.sls

@@ -1,22 +1,17 @@
 # vim: set syntax=yaml ts=2 sw=2 sts=2 et :
 
+{% if salt['qvm.exists']('cacher') %}
+
 /etc/apt/sources.list:
   file.replace:
+    - names:
+      - /etc/apt/sources.list
+      - /etc/apt/sources.list.d/qubes-r4.list
     - pattern: 'https:'
     - repl: 'http://HTTPS/'
     - flags: [ 'IGNORECASE', 'MULTILINE' ]
 
-/etc/apt/sources.list.d/qubes-r4.list:
-  file.replace:
-    - pattern: 'https:'
-    - repl: 'http://HTTPS/'
-    - flags: [ 'IGNORECASE', 'MULTILINE' ]
-
-allow-testing:
-  file.uncomment:
-    - name: /etc/apt/sources.list.d/qubes-r4.list
-    - regex: ^deb\s.*qubes-os.org.*-testing
-    - backup: false
+{% endif %}
 
 installed:
   pkg.installed: