Merge pull request #535 from hashicorp/f-warn-unused-config

Warn the user when they specify a config file / folder that doesn't add any configuration options

command/agent/command.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"reflect"
 	"sort"
 	"strconv"
 	"strings"
@@ -135,6 +136,12 @@ func (c *Command) readConfig() *Config {
 			return nil
 		}
 
+		// The user asked us to load some config here but we didn't find any,
+		// so we'll complain but continue.
+		if current == nil || reflect.DeepEqual(current, &Config{}) {
+			c.Ui.Warn(fmt.Sprintf("No configuration loaded from %s", path))
+		}
+
 		if config == nil {
 			config = current
 		} else {