lib/chef/knife/cook.rb in knife-solo-0.0.3 vs lib/chef/knife/cook.rb in knife-solo-0.0.4

@@ -25,10 +25,12 @@
 
         rsync_kitchen
 
         add_patches
 
+        check_chef_version
+
         logging_arg = "-l debug" if config[:verbosity] > 0
         stream_command <<-BASH
           sudo chef-solo -c #{chef_path}/solo.rb \
                          -j #{chef_path}/#{node_config} \
                          #{logging_arg}
@@ -62,19 +64,26 @@
 
       def patch_path
         Array(Chef::Config.cookbook_path).first + "/chef_solo_patches/libraries"
       end
 
-      # TODO (mat): Let rsync write to /var/chef-solo with sudo somehow
       def rsync_kitchen
         system %Q{rsync -rlP --rsh="ssh #{ssh_args}" --delete --exclude '.*' ./ :#{chef_path}}
       end
 
       def add_patches
         run_command "mkdir -p #{patch_path}"
         Dir[Pathname.new(__FILE__).dirname.join("patches", "*.rb")].each do |patch|
           system %Q{rsync -rlP --rsh="ssh #{ssh_args}" #{patch} :#{patch_path}}
         end
+      end
+
+      def check_chef_version
+        constraint = "~>0.10.4"
+        result = run_command <<-BASH
+          ruby -rubygems -e "gem 'chef', '#{constraint}'"
+        BASH
+        raise "The chef gem on #{host} is out of date. Please run `#{$0} prepare #{ssh_args}` to upgrade Chef to #{constraint}." unless result.success?
       end
     end
   end
 end