Add machine readable bool endpoint to terminal ui

internal/runner/ui.go

@@ -42,6 +42,10 @@ func (u *runnerUI) Interactive() bool {
 	return false
 }
 
+func (u *runnerUI) MachineReadable() bool {
+	return false
+}
+
 func (u *runnerUI) ClearLine() {
 	// NO-OP - noninteractive
 }

internal/runner/ui_multi.go

@@ -52,6 +52,15 @@ func (u *multiUI) Interactive() bool {
 	return false
 }
 
+func (u *multiUI) MachineReadable() bool {
+	for _, u := range u.UIs {
+		if u.MachineReadable() {
+			return true
+		}
+	}
+	return false
+}
+
 func (u *multiUI) Output(msg string, raw ...interface{}) {
 	for _, u := range u.UIs {
 		u.Output(msg, raw...)

lib/vagrant/ui/remote.rb

@@ -44,7 +44,7 @@ module Vagrant
       end
 
       def machine(type, *data)
-        if client.is_interactive
+        if !client.is_machine_readable
           @logger.info("Machine: #{type} #{data.inspect}")
           return
         end

plugins/commands/serve/client/terminal.rb

@@ -22,6 +22,10 @@ module VagrantPlugins
           client.is_interactive(Empty.new).interactive
         end
 
+        def is_machine_readable
+          client.is_machine_readable(Empty.new).machine_readable
+        end
+
         def input(prompt, **opts)
           event_resp = client.events(
             [