Add Rocky Linux guest support

plugins/guests/rocky/cap/flavor.rb

@@ -0,0 +1,23 @@
+module VagrantPlugins
+  module GuestRocky
+    module Cap
+      class Flavor
+        def self.flavor(machine)
+          # Read the version file
+          version = ""
+          machine.communicate.sudo("source /etc/os-release && printf $VERSION_ID") do |type, data|
+            if type == :stdout
+              version = data.split(".").first.to_i
+            end
+          end
+
+          if version.nil? || version < 1
+            :rocky
+          else
+            "rocky_#{version}".to_sym
+          end
+        end
+      end
+    end
+  end
+end

plugins/guests/rocky/guest.rb

@@ -0,0 +1,10 @@
+require_relative "../linux/guest"
+
+module VagrantPlugins
+  module GuestRocky
+    class Guest < VagrantPlugins::GuestLinux::Guest
+      # Name used for guest detection
+      GUEST_DETECTION_NAME = "rocky".freeze
+    end
+  end
+end

plugins/guests/rocky/plugin.rb

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

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

@@ -0,0 +1,36 @@
+require_relative "../../../../base"
+
+describe "VagrantPlugins::GuestRocky::Cap::Flavor" do
+  let(:caps) do
+    VagrantPlugins::GuestRocky::Plugin
+      .components
+      .guest_capabilities[:rocky]
+  end
+
+  let(:machine) { double("machine") }
+  let(:comm) { VagrantTests::DummyCommunicator::Communicator.new(machine) }
+
+  before do
+    allow(machine).to receive(:communicate).and_return(comm)
+  end
+
+  after do
+    comm.verify_expectations!
+  end
+
+  describe ".flavor" do
+    let(:cap) { caps.get(:flavor) }
+
+    {
+      "" => :rocky,
+      "8.2" => :rocky_8,
+      "9" => :rocky_9,
+      "invalid" => :rocky
+    }.each do |str, expected|
+      it "returns #{expected} for #{str}" do
+        comm.stub_command("source /etc/os-release && printf $VERSION_ID", stdout: str)
+        expect(cap.flavor(machine)).to be(expected)
+      end
+    end
+  end
+end