[dev_setup] Cache Node.js tarballs

Node.js source tarballs are now cached to speed up repeated
installations.
  Test plan: run dev_setup without cache, with cache, and with a
corrupted cached tarball.

Change-Id: Id1b8e3626cd9491cfd26e9b338dbbc75eca742cc

dev_setup/cookbooks/node/attributes/node04.rb

@@ -6,3 +6,4 @@ default[:node04][:source] = "http://nodejs.org/dist/node-v#{node04[:version]}.ta
 default[:node04][:npm][:version] = "1.0.106"
 default[:node04][:npm][:source] = "http://registry.npmjs.org/npm/-/npm-#{node[:node04][:npm][:version]}.tgz"
 default[:node04][:npm][:path] = File.join(node[:deployment][:home], "deploy", "nodes", "npm-#{node[:node04][:npm][:version]}")
+default[:node][:checksums]["0.4.12"] = "c01af05b933ad4d2ca39f63cac057f54f032a4d83cff8711e42650ccee24fce4"

dev_setup/cookbooks/node/attributes/node06.rb

@@ -2,3 +2,5 @@ include_attribute "deployment"
 default[:node06][:version] = "0.6.8"
 default[:node06][:path] = File.join(node[:deployment][:home], "deploy", "nodes", "node-#{node06[:version]}")
 default[:node06][:source] = "http://nodejs.org/dist/v#{node06[:version]}/node-v#{node06[:version]}.tar.gz"
+
+default[:node][:checksums]["0.6.8"] = "e6cbfc5ccdbe10128dbbd4dc7a88c154d80f8a39c3a8477092cf7d25eef78c9c"

dev_setup/cookbooks/node/libraries/nodejs_install.rb

@@ -4,10 +4,10 @@ module NodeInstall
       package pkg
     end
 
-    remote_file File.join("", "tmp", "node-v#{node_version}.tar.gz") do
+    remote_file File.join(node[:deployment][:setup_cache], "node-v#{node_version}.tar.gz") do
       owner node[:deployment][:user]
       source node_source
-      not_if { ::File.exists?(File.join("", "tmp", "node-v#{node_version}.tar.gz")) }
+      checksum node[:node][:checksums][node_version]
     end
 
     directory node_path do