Disable the plugin on machines backed by cloud providers (fix GH-45)

lib/vagrant-cachier/config.rb

@@ -28,6 +28,12 @@ module VagrantPlugins
       def validate(machine)
         errors = _detected_errors
 
+        if enabled? && backed_by_cloud_provider?(machine)
+          machine.ui.warn(I18n.t('vagrant_cachier.backed_by_cloud_provider',
+                                 provider: machine.provider_name))
+          disable!
+        end
+
         if enabled? && ! ALLOWED_SCOPES.include?(@scope.to_s)
           errors << I18n.t('vagrant_cachier.unknown_cache_scope',
                             allowed:     ALLOWED_SCOPES.inspect,
@@ -55,6 +61,12 @@ module VagrantPlugins
         @synced_folder_opts = nil if @synced_folder_opts == UNSET_VALUE
         @buckets = @buckets ? @buckets.dup : {}
       end
+
+      private
+
+      def backed_by_cloud_provider?(machine)
+        CLOUD_PROVIDERS.include?(machine.provider_name.to_s)
+      end
     end
   end
 end

lib/vagrant-cachier/plugin.rb

@@ -11,12 +11,16 @@ module VagrantPlugins
   module Cachier
     class Plugin < Vagrant.plugin('2')
       name 'vagrant-cachier'
-
       config 'cache' do
         require_relative "config"
         Config
       end
     end
+
+    # Keep an eye on https://github.com/mitchellh/vagrant/wiki/Available-Vagrant-Plugins#wiki-providers
+    # for more.
+    CLOUD_PROVIDERS = %w( aws cloudstack digitalocean hp joyent openstack rackspace
+                          softlayer proxmox managed virtualbox )
   end
 end
 

locales/en.yml

@@ -16,3 +16,6 @@ en:
       scoped cache dirs starting with the 0.3.0 version of the plugin.
     unable_to_ssh: |-
       vagrant-cachier was unable to SSH into the VM to remove symlinks!
+    backed_by_cloud_provider: |-
+      The machine is backed by a cloud provider (%{provider}), caching
+      will be disabled.