plugins/provisioners: put generated inventory file in vagrantfile dir

CHANGELOG.md

@@ -20,8 +20,10 @@ IMPROVEMENTS:
   - guests/suse: Supports private/public networks. [GH-1689]
   - hosts/fedora: Support RHEL as a host. [GH-2088]
   - provisioners/ansible: Ansible `inventory_path` can be a directory now. [GH-2035]
-  - provisoiners/ansible: Extra verbose option by setting `config.verbose`
+  - provisioners/ansible: Extra verbose option by setting `config.verbose`
     to `extra`. [GH-1979]
+  - provisioners/ansible: `inventory_path` will be auto-generated if not
+    specified. [GH-1907]
 
 BUG FIXES:
 

plugins/provisioners/ansible/provisioner.rb

@@ -62,13 +62,16 @@ module VagrantPlugins
         return config.inventory_file if config.inventory_file
 
         ssh = @machine.ssh_info
-        generated_inventory_file = "vagrant_ansible_inventory_#{machine.name}"
+
-        File.open(generated_inventory_file, 'w') do |file|
+        generated_inventory_file =
+          @machine.env.root_path.join("vagrant_ansible_inventory_#{machine.name}")
+
+        generated_inventory_file.open('w') do |file|
           file.write("# Generated by Vagrant\n\n")
           file.write("#{machine.name} ansible_ssh_host=#{ssh[:host]} ansible_ssh_port=#{ssh[:port]}\n")
         end
 
-        return generated_inventory_file
+        return generated_inventory_file.to_s
       end
     end
   end