guests/amazon: Initial addition

Fixes GH-7254

plugins/guests/amazon/cap/flavor.rb

@@ -0,0 +1,14 @@
+module VagrantPlugins
+  module GuestAmazon
+    module Cap
+      class Flavor
+        def self.flavor(machine)
+          # Amazon AMI is a frankenstien RHEL, mainly based on 6
+          # Maybe in the future if they incoporate RHEL 7 elements
+          # this should be extended to read /etc/os-release or similar
+          return :rhel
+        end
+      end
+    end
+  end
+end

plugins/guests/amazon/guest.rb

@@ -0,0 +1,9 @@
+module VagrantPlugins
+  module GuestAmazon
+    class Guest < Vagrant.plugin("2", :guest)
+      def detect?(machine)
+        machine.communicate.test("grep 'Amazon Linux AMI' /etc/os-release")
+      end
+    end
+  end
+end

plugins/guests/amazon/plugin.rb

@@ -0,0 +1,20 @@
+require "vagrant"
+
+module VagrantPlugins
+  module GuestAmazon
+    class Plugin < Vagrant.plugin("2")
+      name "Amazon Linux guest"
+      description "Amazon linux guest support."
+
+      guest(:amazon, :redhat) do
+        require_relative "guest"
+        Guest
+      end
+
+      guest_capability(:amazon, :flavor) do
+        require_relative "cap/flavor"
+        Cap::Flavor
+      end
+    end
+  end
+end

test/unit/plugins/guests/amazon/cap/flavor_test.rb

@@ -0,0 +1,19 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestAmazon::Cap::Flavor" do
+  let(:caps) do
+    VagrantPlugins::GuestAmazon::Plugin
+      .components
+      .guest_capabilities[:amazon]
+  end
+
+  let(:machine) { double("machine") }
+
+  describe ".flavor" do
+    let(:cap) { caps.get(:flavor) }
+
+    it "returns rhel" do
+      expect(cap.flavor(machine)).to be(:rhel)
+    end
+  end
+end