guests/arch: Add NFS capabilities

plugins/guests/arch/cap/nfs.rb

@@ -0,0 +1,35 @@
+module VagrantPlugins
+  module GuestArch
+    module Cap
+      class NFS
+        def self.nfs_client_installed(machine)
+          machine.communicate.test("pacman -Q nfs-utils")
+        end
+
+        def self.nfs_pre(machine)
+          comm = machine.communicate
+
+          # There is a bug in NFS where the rpcbind functionality is not started
+          # and it's not a dependency of nfs-utils. Read more here:
+          #
+          #   https://bbs.archlinux.org/viewtopic.php?id=193410
+          #
+          comm.sudo <<-EOH.gsub(/^ {12}/, "")
+            set -e
+            systemctl enable rpcbind
+            systemctl start rpcbind
+          EOH
+        end
+
+        def self.nfs_client_install(machine)
+          comm = machine.communicate
+          comm.sudo <<-EOH.gsub(/^ {12}/, "")
+            set -e
+            pacman --noconfirm -Syy
+            pacman --noconfirm -S nfs-utils ntp
+          EOH
+        end
+      end
+    end
+  end
+end

plugins/guests/arch/plugin.rb

@@ -20,6 +20,21 @@ module VagrantPlugins
         require_relative "cap/configure_networks"
         Cap::ConfigureNetworks
       end
+
+      guest_capability(:arch, :nfs_client_install) do
+        require_relative "cap/nfs"
+        Cap::NFS
+      end
+
+      guest_capability(:arch, :nfs_client_installed) do
+        require_relative "cap/nfs"
+        Cap::NFS
+      end
+
+      guest_capability(:arch, :nfs_pre) do
+        require_relative "cap/nfs"
+        Cap::NFS
+      end
     end
   end
 end

plugins/synced_folders/nfs/synced_folder.rb

@@ -101,8 +101,16 @@ module VagrantPlugins
         end
 
         # Mount them!
-        machine.guest.capability(
-          :mount_nfs_folder, nfsopts[:nfs_host_ip], mount_folders)
+        if machine.guest.capability?(:nfs_pre)
+          machine.guest.capability(:nfs_pre)
+        end
+
+        machine.guest.capability(:mount_nfs_folder,
+          nfsopts[:nfs_host_ip], mount_folders)
+
+        if machine.guest.capability?(:nfs_post)
+          machine.guest.capability(:nfs_post)
+        end
       end
 
       def cleanup(machine, opts)