agent: Ensure logger set up method is public.

This is needed by a Nomad Enterprise code path.

command/agent/command.go

@@ -549,8 +549,11 @@ func (c *Command) IsValidConfig(config, cmdConfig *Config) bool {
 	return true
 }
 
-// setupLoggers is used to set up the logGate and our logOutput.
-func setupLoggers(ui cli.Ui, config *Config) (*gatedwriter.Writer, io.Writer) {
+// SetupLoggers is used to set up the logGate and our logOutput.
+//
+// The function needs to be public due to the way it is used within the Nomad
+// Enterprise codebase.
+func SetupLoggers(ui cli.Ui, config *Config) (*gatedwriter.Writer, io.Writer) {
 
 	// Pull the log level from the configuration, ensure it is titled and then
 	// perform validation. Do this before the gated writer, as this can
@@ -801,7 +804,7 @@ func (c *Command) Run(args []string) int {
 	}
 
 	// Set up the log outputs.
-	logGate, logOutput := setupLoggers(c.Ui, config)
+	logGate, logOutput := SetupLoggers(c.Ui, config)
 	if logGate == nil {
 		return 1
 	}

command/agent/command_test.go

@@ -639,7 +639,7 @@ func Test_setupLoggers_logFile(t *testing.T) {
 	}
 
 	// Generate the loggers and ensure the correct error is generated.
-	gatedWriter, writer := setupLoggers(mockUI, cfg)
+	gatedWriter, writer := SetupLoggers(mockUI, cfg)
 	must.Nil(t, gatedWriter)
 	must.Nil(t, writer)
 	must.StrContains(t, mockUI.ErrorWriter.String(), "Invalid log level: WARNING")
@@ -650,7 +650,7 @@ func Test_setupLoggers_logFile(t *testing.T) {
 	// Update the log level, so that it is a valid option and set up the
 	// loggers again.
 	cfg.LogLevel = "warn"
-	gatedWriter, writer = setupLoggers(mockUI, cfg)
+	gatedWriter, writer = SetupLoggers(mockUI, cfg)
 	must.NotNil(t, gatedWriter)
 	must.NotNil(t, writer)