From ea3262bc62297f7d4632f9f2f0f5e9f1bc8d59eb Mon Sep 17 00:00:00 2001
From: Tom Duffield <tom@chef.io>
Date: Wed, 17 Feb 2016 17:30:56 -0600
Subject: Add node UUID generator

---
 chef-config/lib/chef-config/config.rb |  3 +++
 lib/chef/node.rb                      | 25 +++++++++++++++++++++++++
 spec/unit/node_spec.rb                | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/chef-config/lib/chef-config/config.rb b/chef-config/lib/chef-config/config.rb
index ac55853bc7..a7dc38d3a4 100644
--- a/chef-config/lib/chef-config/config.rb
+++ b/chef-config/lib/chef-config/config.rb
@@ -264,6 +264,9 @@ module ChefConfig
     # '/tmp/chef-client-running.pid'
     default(:lockfile) { PathHelper.join(file_cache_path, "chef-client-running.pid") }
 
+    # The file where the UUID for the node is stored
+    default(:node_uuid_path) { platform_specific_path("/etc/chef/node-uuid") }
+
     ## Daemonization Settings ##
     # What user should Chef run as?
     default :user, nil
diff --git a/lib/chef/node.rb b/lib/chef/node.rb
index 0471fe1171..c57e452f19 100644
--- a/lib/chef/node.rb
+++ b/lib/chef/node.rb
@@ -604,6 +604,31 @@ class Chef
       from_hash(Chef::ServerAPI.new(Chef::Config[:chef_server_url]).get("nodes/#{name}"))
     end
 
+    # Node UUID
+    # Read from disk, or generate & save
+    # TODO: validate that the contents of the file are valid UUIDv4. If not, regenerate
+    def self.uuid
+      if ::File.exist?(Chef::Config[:node_uuid_path])
+        # read_uuid_from_file
+        ::File.read(Chef::Config[:node_uuid_path])
+      else
+        # generate_and_save_uuid
+        uuid = SecureRandom.uuid
+        ::File.write(Chef::Config[:node_uuid_path], uuid)
+        uuid
+      end
+    end
+
+    Node.uuid
+
+    # def self.uuid
+    #   begin
+    #     read_uuid_from_file
+    #   rescue
+    #     generate_and_save_uuid
+    #   end
+    # end
+
     # Remove this node via the REST API
     def destroy
       chef_server_rest.delete("nodes/#{name}")
diff --git a/spec/unit/node_spec.rb b/spec/unit/node_spec.rb
index 5304ac9f92..12fd02b918 100644
--- a/spec/unit/node_spec.rb
+++ b/spec/unit/node_spec.rb
@@ -1562,4 +1562,36 @@ describe Chef::Node do
     end
   end
 
+  describe "uuid" do
+    let(:node_uuid_string) { "bb322253-b674-4efd-9090-2d38681cc3fb" }
+    let(:node_uuid_file_path) { "/etc/chef/node-uuid" }
+
+    before do
+      Chef::Config[:node_uuid_path] = node_uuid_file_path
+    end
+
+    context "when an UUID file does not exist" do
+      before do
+        allow(::File).to receive(:exist?).with(node_uuid_file_path).and_return(false)
+      end
+
+      it "creates a new one" do
+        allow(SecureRandom).to receive(:uuid).and_return(node_uuid_string)
+        expect(::File).to receive(:write).with(node_uuid_file_path, node_uuid_string)
+        expect(Chef::Node.uuid).to eq(node_uuid_string)
+      end
+    end
+
+    context "when an UUID file does exist" do
+      before do
+        allow(::File).to receive(:exist?).with(node_uuid_file_path).and_return(true)
+      end
+
+      it "reads value from file" do
+        expect(::File).to receive(:read).with(node_uuid_file_path).and_return(node_uuid_string)
+        expect(Chef::Node.uuid).to eq(node_uuid_string)
+      end
+    end
+  end
+
 end
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