first whack at rvm support in vagrant-cachier

lib/vagrant-cachier/bucket/rvm.rb

@@ -0,0 +1,39 @@
+module VagrantPlugins
+  module Cachier
+    class Bucket
+      class Rvm < Bucket
+        def self.capability
+          :rvmdir
+        end
+
+        def install
+          machine = @env[:machine]
+          guest   = machine.guest
+
+          if guest.capability?(:rvmdir)
+            if rvmdir_path = guest.capability(:rvmdir)
+              prefix      = rvmdir_path.split('/').last
+              bucket_path = "/tmp/vagrant-cache/#{@name}/#{prefix}"
+              machine.communicate.tap do |comm|
+                comm.execute("mkdir -p #{bucket_path}")
+
+                rvm_cache_path = "#{rvmdir_path}/archives"
+
+                @env[:cache_dirs] << rvm_cache_path
+
+                unless comm.test("test -L #{rvm_cache_path}")
+                  comm.sudo("rm -rf #{rvm_cache_path}")
+                  comm.sudo("mkdir -p `dirname #{rvm_cache_path}`")
+                  comm.sudo("ln -s #{bucket_path} #{rvm_cache_path}")
+                end
+              end
+            end
+          else
+            # TODO: Raise a better error
+            raise "You've configured a RVM cache for a guest machine that does not support it!"
+          end
+        end
+      end
+    end
+  end
+end

lib/vagrant-cachier/cap/linux/rvmdir.rb

@@ -0,0 +1,21 @@
+module VagrantPlugins
+  module Cachier
+    module Cap
+      module Linux
+        module Rvmdir
+          def self.rvmdir(machine)
+            rvmdir = nil
+            machine.communicate.tap do |comm|
+              return unless comm.test('rvm info')
+              comm.execute 'echo $rvm_path' do |buffer, output|
+                rvmdir = output.chomp if buffer == :stdout
+              end
+            end
+            return rvmdir
+          end
+        end
+      end
+    end
+  end
+end
+