Replace 9p synced folder :owner with :access (#1571)

The 9p synced folder option :owner is better named as :access, which is
documented by 9p and less likely to cause confusion on the expected
behaviour as it does not control the owner of the files.

Relates-To: #378

spec/unit/cap/mount_9p_spec.rb

@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'support/sharedcontext'
+
+require 'vagrant-libvirt'
+
+describe 'VagrantPlugins::ProviderLibvirt::Cap::Mount9P' do
+  include_context 'unit'
+
+  subject do
+    VagrantPlugins::ProviderLibvirt::Plugin
+      .components
+      .guest_capabilities[:linux]
+      .get(:mount_9p_shared_folder)
+  end
+
+  let(:options) { {} }
+  describe '#mount_9p_shared_folder' do
+    let(:synced_folders) { {
+      "/vagrant" => {
+        :hostpath => '/home/test/default',
+        :disabled=>false,
+        :guestpath=>'~/vagrant',
+        :type => :"9p",
+      }.merge(options),
+    } }
+
+    before do
+      allow(guest).to receive(:capability).and_return('/home/vagrant/vagant')
+      allow(communicator).to receive(:sudo).with('mkdir -p /home/vagrant/vagant')
+    end
+
+    it 'should succeed' do
+      expect(communicator).to receive(:sudo).with('modprobe 9p')
+      expect(communicator).to receive(:sudo).with('modprobe 9pnet_virtio')
+      expect(communicator).to receive(:sudo).with(/mount -t 9p.*/, instance_of(Hash))
+      expect(ui).to_not receive(:warn)
+
+      subject.mount_9p_shared_folder(machine, synced_folders)
+    end
+
+    context 'with owner option set' do
+      let(:options) { {
+        :owner=> 'user',
+      } }
+
+      it 'should warn option is deprecated' do
+        expect(communicator).to receive(:sudo).with('modprobe 9p')
+        expect(communicator).to receive(:sudo).with('modprobe 9pnet_virtio')
+        expect(communicator).to receive(:sudo).with(
+          /mount -t 9p -o trans=virtio,access=user .*/,
+          instance_of(Hash))
+        expect(ui).to receive(:warn).with(/`:owner` option for 9p mount options deprecated/)
+
+        subject.mount_9p_shared_folder(machine, synced_folders)
+      end
+
+      context 'with access option set' do
+        let(:options) { {
+          :owner=> 'user',
+          :access=> 'user',
+        } }
+
+        it 'should warn owner option is ignored' do
+          expect(communicator).to receive(:sudo).with('modprobe 9p')
+          expect(communicator).to receive(:sudo).with('modprobe 9pnet_virtio')
+          expect(communicator).to receive(:sudo).with(/mount -t 9p.*/, instance_of(Hash))
+          expect(ui).to receive(:warn).with(/deprecated `:owner` option ignored/)
+
+          subject.mount_9p_shared_folder(machine, synced_folders)
+        end
+      end
+    end
+  end
+end