Add option to delete private AMIs

ec2-janitor/ec2-janitor.rb

@@ -62,13 +62,19 @@ def instances
     end
   end
 
-  desc "images", "Displays images in all regions"
+  desc "images", "Displays images in all regions. Optionally deletes all private AMIs."
+  method_option :'prune', :type => :boolean, :desc => "Delete all private AMIs."
   def images
     results = []
+    deleted = []
     threaded_regions do |region|
       region.images.with_owner('self').each do |image|
         results << [ region.name, image.name, image.id,
                      (image.public? ? 'Public' : 'Private') ]
+        if options.prune? && !image.public?
+          deleted << image.id
+          image.delete
+        end
       end
     end
     if results.empty?
@@ -77,6 +83,9 @@ def images
       puts table(['Region', 'Name', 'AMI ID', 'Perms'],
                  *results.sort_by{ |k| [k[0], k[1]] })
     end
+    unless deleted.empty?
+      puts "Deleted private AMIs: #{deleted.join(', ')}"
+    end
   end
 
   desc "textile VERSION ARCH", "Output matching openSUSE AMI IDs from all regions in Textile format. Useful for SUSE Gallery descriptions.\nVERSION is the openSUSE release version (eg. 12.2).\nARCH is the AMI architecture (i386, x86_64)."